CA1222128A - Enhancement of efficiency of acid gas scrubbing processes - Google Patents
Enhancement of efficiency of acid gas scrubbing processesInfo
- Publication number
- CA1222128A CA1222128A CA000470357A CA470357A CA1222128A CA 1222128 A CA1222128 A CA 1222128A CA 000470357 A CA000470357 A CA 000470357A CA 470357 A CA470357 A CA 470357A CA 1222128 A CA1222128 A CA 1222128A
- Authority
- CA
- Canada
- Prior art keywords
- sorbent
- gas
- rich
- section
- acid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1425—Regeneration of liquid absorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C7/00—Purification; Separation; Use of additives
- C07C7/11—Purification; Separation; Use of additives by absorption, i.e. purification or separation of gaseous hydrocarbons with the aid of liquids
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- General Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Organic Chemistry (AREA)
- Water Supply & Treatment (AREA)
- Gas Separation By Absorption (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
ABSTRACT
There is disclosed a process for enhanc-ing the efficiency of acid gas scrubbing processes by flashing from the rich absorbent a portion of the acid gases prior to regenerating the sorbents for recycling. The flash is improved when nucleating agents, and optionally stripping gases, are employed.
32,576-F
There is disclosed a process for enhanc-ing the efficiency of acid gas scrubbing processes by flashing from the rich absorbent a portion of the acid gases prior to regenerating the sorbents for recycling. The flash is improved when nucleating agents, and optionally stripping gases, are employed.
32,576-F
Description
~222~28 USE OF NUCLEATING AGENTS FOR
ENHANCEMENT OF EFFI C IENCY
OF ACID GAS SCRUBBING PROCESSES
The removal of acid gases such as H2S, S02, C2 and the like from natural and synthetic gases con-taining the s~me using a sorbent for the acid gas(es), regenerating the sorbent to release the acid gas(es) and returning a lean sorbent to the acid gas removal step is an old and well documented technology. The nature of the sorbents is wide and includes hot potas-sium carbonate, the alkanolamines, the glycols, as well as sulfinol; and the like to name but a few.
Each of these sorbents has a particular ad~antage for specific acid gases or natural or synthetic gas composition, physical condition of the gas contain-ing the same, as well as purpose of the removal, i.e., clean up a gas stream for combustion or chemical usage or recover~ of a gas from the other components, for example C02 from a flue gas.
Recent pressures on treatment or recovery costs in light of escalating gas prices, environmental 32,576-F -l~
~22Z~Z~3 concerns, and/or potential large volume uses of a com-ponent, e.g., C02, if price is low, have prompted mod-ification of the commercially practiced process to increase the loadings of the sorbents and/or increase the acid gas removal capacity or gas recovery capac-ity in existing plants by using higher concentrations of sorbents as well as more difficulty regenerated sorbents. These modified processes usually require higher heat duty in the regeneration units, in many cases resulting in, in addition to higher fuel costs, more severe corrosion problems.
It is therefore an object of the present invention to provide a means to more effectively util-ize these modified processes while reducing costs and corrosion problems attendant the regenerator sections in the modified versions.
In accordance with the present invention, a rich sorbent solution, e.g., monoethanolamine, can have the acid gas content reduced prior to regenera-tion by contacting the rich sorbent with a nucleatingagent (e.g., carbon particles), with or without sub-jecting the rich sorbent to gas stripping. The effect of these two simple operations flashes a considerable amount of the acid gases held by the sorbent. These acid gases can be combusted if the stripping gas is a combustible gas, or recovered or reacted as in a Claus tail gas unit. The result of flashing part of the acid gas content of the rich sorbent is that less heat is required to regenerate the sorbent, in 3~ certain instances reduces the load on tail gas recov-ery or conversion units, and reduces the corrosion potential in the regeneration section.
32,576-F -2-1222~28 Substantially any nucleating agent may be employed so long as it does not react with the sorbent or the acid gas(es) being nucleated. One can employ carbon particles, activated car-~on or charcoal particles, ceramic particles, wire meshes, non--woven mat or packings and the like.
Similarly, the nature of the stripping gas is not critical so lony as it does not react with either the sorbent or the acid yas(es). One can thus employ natural gas, treated or untreated, synthetic gas(es), steam, nitroyen, carbon dioxide if CO2 is not the gas being sorbed, and the like.
While the nucleatiny agent alone may be used, there is even greater improvement if a yas is also used.
It is further to be understood that the operations may be carried out individually in different vessels, if so, prefer-ably with the nucleating step being the first.
Several modifications in existing commercial gas treating plants are illustrated in the drawings of which;
Figure 1 represents a flow diagram of a commercial acid gas treating plant incorporatiny the modification of the present invention;
lZZ21Z8 Figure 2 represents the same plant with only the stripping gas being incorporated;
Figure 3 illustrates a flow diagram of the same plant using both nucle~tion and stripping gas wherein the stripping gas is the fuel gas to the reboiler of the stripping still (regenerator);
Figure 4 illustrates a commercial plant utilizing only nucleation in accordance with the present invention; and, Figure 5 illustrates the use of fuel gas to an eductor to decrease the partial pressure over a nucleating bed.
In accordance with the present invention, a gas treating plant as illustrated in Figure 1 con-sisting of a contactor or absorber (10) which pro-vides a countercurrent contact of a sorbént with the sour gas (11) to be treated, a rich-lean heat exchanger (12) and in accordance with the present invention a rich sorbent flash tank (13) containing the nucleat-ing agent (14) and provisions for distributing thestripping gas (15), optionally a booster pump (16), and a stripping still or regenerator (17) having, (a) a reboiler (18) associated with it to heat the sorbent, and, (b) a condenser (19) to condense the overhead, for return as a liquid the condensed sOr-bent through (c) an accumulator (20) to the top of the still (17). The hot lean sorbent (21) from the reboiler (18) after passing through the rich-lean 32,576-F -4-.
~2221Z8 exchanger (12), a booster pump (22) if necessary, and a lean cooler (23) to cool the sorbent to the best sorbîng temperature is returned via pump (24), to the contactor (10).
The modification is simple and can be incorporated with little capital investment. The savings in fuel, corrosion and the like as well as the ability to increase both the concentration of the sorbent solution and the loadings of acid gas in the sorbent, all constitute economic advantages as well as permitting retrofit usage of existing plants many designed for 10-20 percent aqueous sor-bent solutions.
The remainder of the modifications are lS self-evident from the above description and drawings.
32,576-F -5-:
ENHANCEMENT OF EFFI C IENCY
OF ACID GAS SCRUBBING PROCESSES
The removal of acid gases such as H2S, S02, C2 and the like from natural and synthetic gases con-taining the s~me using a sorbent for the acid gas(es), regenerating the sorbent to release the acid gas(es) and returning a lean sorbent to the acid gas removal step is an old and well documented technology. The nature of the sorbents is wide and includes hot potas-sium carbonate, the alkanolamines, the glycols, as well as sulfinol; and the like to name but a few.
Each of these sorbents has a particular ad~antage for specific acid gases or natural or synthetic gas composition, physical condition of the gas contain-ing the same, as well as purpose of the removal, i.e., clean up a gas stream for combustion or chemical usage or recover~ of a gas from the other components, for example C02 from a flue gas.
Recent pressures on treatment or recovery costs in light of escalating gas prices, environmental 32,576-F -l~
~22Z~Z~3 concerns, and/or potential large volume uses of a com-ponent, e.g., C02, if price is low, have prompted mod-ification of the commercially practiced process to increase the loadings of the sorbents and/or increase the acid gas removal capacity or gas recovery capac-ity in existing plants by using higher concentrations of sorbents as well as more difficulty regenerated sorbents. These modified processes usually require higher heat duty in the regeneration units, in many cases resulting in, in addition to higher fuel costs, more severe corrosion problems.
It is therefore an object of the present invention to provide a means to more effectively util-ize these modified processes while reducing costs and corrosion problems attendant the regenerator sections in the modified versions.
In accordance with the present invention, a rich sorbent solution, e.g., monoethanolamine, can have the acid gas content reduced prior to regenera-tion by contacting the rich sorbent with a nucleatingagent (e.g., carbon particles), with or without sub-jecting the rich sorbent to gas stripping. The effect of these two simple operations flashes a considerable amount of the acid gases held by the sorbent. These acid gases can be combusted if the stripping gas is a combustible gas, or recovered or reacted as in a Claus tail gas unit. The result of flashing part of the acid gas content of the rich sorbent is that less heat is required to regenerate the sorbent, in 3~ certain instances reduces the load on tail gas recov-ery or conversion units, and reduces the corrosion potential in the regeneration section.
32,576-F -2-1222~28 Substantially any nucleating agent may be employed so long as it does not react with the sorbent or the acid gas(es) being nucleated. One can employ carbon particles, activated car-~on or charcoal particles, ceramic particles, wire meshes, non--woven mat or packings and the like.
Similarly, the nature of the stripping gas is not critical so lony as it does not react with either the sorbent or the acid yas(es). One can thus employ natural gas, treated or untreated, synthetic gas(es), steam, nitroyen, carbon dioxide if CO2 is not the gas being sorbed, and the like.
While the nucleatiny agent alone may be used, there is even greater improvement if a yas is also used.
It is further to be understood that the operations may be carried out individually in different vessels, if so, prefer-ably with the nucleating step being the first.
Several modifications in existing commercial gas treating plants are illustrated in the drawings of which;
Figure 1 represents a flow diagram of a commercial acid gas treating plant incorporatiny the modification of the present invention;
lZZ21Z8 Figure 2 represents the same plant with only the stripping gas being incorporated;
Figure 3 illustrates a flow diagram of the same plant using both nucle~tion and stripping gas wherein the stripping gas is the fuel gas to the reboiler of the stripping still (regenerator);
Figure 4 illustrates a commercial plant utilizing only nucleation in accordance with the present invention; and, Figure 5 illustrates the use of fuel gas to an eductor to decrease the partial pressure over a nucleating bed.
In accordance with the present invention, a gas treating plant as illustrated in Figure 1 con-sisting of a contactor or absorber (10) which pro-vides a countercurrent contact of a sorbént with the sour gas (11) to be treated, a rich-lean heat exchanger (12) and in accordance with the present invention a rich sorbent flash tank (13) containing the nucleat-ing agent (14) and provisions for distributing thestripping gas (15), optionally a booster pump (16), and a stripping still or regenerator (17) having, (a) a reboiler (18) associated with it to heat the sorbent, and, (b) a condenser (19) to condense the overhead, for return as a liquid the condensed sOr-bent through (c) an accumulator (20) to the top of the still (17). The hot lean sorbent (21) from the reboiler (18) after passing through the rich-lean 32,576-F -4-.
~2221Z8 exchanger (12), a booster pump (22) if necessary, and a lean cooler (23) to cool the sorbent to the best sorbîng temperature is returned via pump (24), to the contactor (10).
The modification is simple and can be incorporated with little capital investment. The savings in fuel, corrosion and the like as well as the ability to increase both the concentration of the sorbent solution and the loadings of acid gas in the sorbent, all constitute economic advantages as well as permitting retrofit usage of existing plants many designed for 10-20 percent aqueous sor-bent solutions.
The remainder of the modifications are lS self-evident from the above description and drawings.
32,576-F -5-:
Claims (4)
1. In a process for removing acid gases from natural or synthetic gases containing the same by contacting the acid gas-containing stream with a regenerable liquid sorbent solution to produce a rich sorbent solution, regenerating the sorbent in a manner to release the acid gases sorbed in said rich sorbent solution to produce a lean sorbent, and recycling said lean sorbent to the contacting step, characterized by subjecting said rich sorbent, prior to regenerating same, to contact with a nucleating agent, thereby to reduce the acid gas content of the rich sorbent solu-tion delivered to the regenerating step.
2. The method of Claim 1 further char-acterized in that the rich sorbent solution is also subjected to contact with a gas, which is non-reac-tive wth the sorbent and the acid gas(es), in a zone wherein acid gases can be flashed from said rich sor-bent solution.
3. An acid gas treatment plant having (1) a contactor section for treating a gas stream 32,576-F -6-with a sorbent solution to produce a rich sorbent stream, and (2) a regeneration section for removing acid gases from the rich sorbent stream, character-ized in that there is interposed between said con-tactor section and said regeneration section, a nucleation section for contacting the rich sorbent stream with a nucleation agent.
4. The plant of Claim 3 further char-acterized in that there is a stripping gas section, which may be physically integral with said nuclea-tion section, for contacting the rich sorbent solu-tion with a gas which is non-reactive with the sor-bent and the acid gas(es).
32,576-F -7-
32,576-F -7-
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US56265483A | 1983-12-19 | 1983-12-19 | |
| US562,654 | 1983-12-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1222128A true CA1222128A (en) | 1987-05-26 |
Family
ID=24247186
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000470357A Expired CA1222128A (en) | 1983-12-19 | 1984-12-18 | Enhancement of efficiency of acid gas scrubbing processes |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0148607A1 (en) |
| JP (1) | JPS60502092A (en) |
| AU (1) | AU556990B2 (en) |
| CA (1) | CA1222128A (en) |
| NO (1) | NO845083L (en) |
| NZ (1) | NZ210553A (en) |
| WO (1) | WO1985002787A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4869884A (en) * | 1988-05-06 | 1989-09-26 | Kerr-Mcgee Chemical Corporation | Process for recovering acidic gases |
| GB9101336D0 (en) * | 1991-01-22 | 1991-03-06 | Turbotak Inc | Stripping method and apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2926753A (en) * | 1958-10-06 | 1960-03-01 | Fluor Corp | Process for carbon dioxide absorption |
| DE3141770A1 (en) * | 1981-10-21 | 1983-05-05 | Linde Ag, 6200 Wiesbaden | METHOD AND DEVICE FOR REGENERATING PHYSICALLY ACTIVE ORGANIC WASHING LIQUIDS |
| DE3222212A1 (en) * | 1982-06-12 | 1983-12-15 | Linde Ag, 6200 Wiesbaden | Process for the elimination of CO2 and/or H2S from gases |
-
1984
- 1984-12-06 AU AU36758/84A patent/AU556990B2/en not_active Ceased
- 1984-12-06 JP JP50446584A patent/JPS60502092A/en active Pending
- 1984-12-06 WO PCT/US1984/001993 patent/WO1985002787A1/en unknown
- 1984-12-13 EP EP84308685A patent/EP0148607A1/en not_active Withdrawn
- 1984-12-13 NZ NZ21055384A patent/NZ210553A/en unknown
- 1984-12-18 CA CA000470357A patent/CA1222128A/en not_active Expired
- 1984-12-18 NO NO845083A patent/NO845083L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU3675884A (en) | 1985-07-12 |
| EP0148607A1 (en) | 1985-07-17 |
| JPS60502092A (en) | 1985-12-05 |
| NZ210553A (en) | 1988-07-28 |
| WO1985002787A1 (en) | 1985-07-04 |
| NO845083L (en) | 1985-06-20 |
| AU556990B2 (en) | 1986-11-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |